Its broken connector on vehicle side . My car es300 3rd gen 2003 ,Bank2 sensor 1 harness color code to o2 sensor? The o2 sensor has one white , one blue,two black . The harness from the car has one black one white one red black one brown.I just want to know harness color code on vehicle side and connecct to harness on o2 sensor .Please.

 

Hello,

Is the wiring to the sensor intact? If so, you can just replace the connector, without cutting any wires, here is a thread on how to do it with the list of all the connectors housings available, and an instruction on how to find the right one.

From the Diagram I found, Blue wire on the Sensor has to go to Orange (or Brown) wire on the car, White wire on the sensor should go to White wire on the car, two of the rest can be connected in either way, it is just a heater element.

Color code, from my experience, is not always to be trusted, to be sure, check the voltages on wires that you have. When the key is in the ON position, two Black wires should have 12V and Ground between them, the Blue wire should have 3.3V on it, White wire should have 3.0V.

Hope this helps and best of luck!

 

I will take your suggestion .Thank you.